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What is a servo hydraulic station? What are the advantages compared to ordinary hydraulic stations?

Published on:

2023-05-12 15:37

By working with built-in or external sensors, servo valves or proportional valves, controllers, etc., a hydraulic control system with high control accuracy and fast response speed can be formed. So that the output of the system, such as displacement, speed or force, can be automatically and quickly and accurately changed with the change of input quantity, at the same time, the output power is greatly amplified.

The working principle of the servohydraulic station
The working principle of hydraulic servo system is the feedback control of fluid power, that is, the use of feedback connection to obtain a deviation signal, and then use the deviation signal to control the energy input of hydraulic energy to the system, so that the system changes in the direction of reducing the deviation, so that the actual output of the system is consistent with the desired value.

1 hydraulic station, 2 relief valves, 3 cylinder blocks, 4 spools, 5 pistons

Schematic diagram of the servo hydraulic station

In the servo hydraulic station, the form of control signals includes electro-hydraulic servo system, electro-hydraulic servo system and gas-liquid servo system.

The given, feedback and comparison links of the system in the hydraulic servo system use mechanical components, which are commonly used in aircraft rudder surface control systems, automobile steering devices, hydraulic profiling machine tools and construction machinery. However, friction, clearance, and inertia in the feedback mechanism can adversely affect the accuracy of the system.

The detection, correction and initial amplification of error signals in electro-hydraulic servo systems use electrical and electronic components or computers to form analog servo systems, digital servo systems or digital-analog hybrid servo systems.

The electro-hydraulic servo system has the advantages of high control accuracy, high response speed, flexible signal processing and wide application, and can form a servo system in terms of position, speed and force.

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Advantages and applications of servo hydraulic stations

Compared with ordinary hydraulic stations, servo hydraulic stations have the following advantages

1. The actuator of the hydraulic system acts fast and the phase changes quickly. In terms of the flow-velocity transfer function, the vast majority is an oscillation stage with a considerable natural frequency, but as the flow rate increases and the parameters are optimally matched, the natural frequency can be extended to be comparable to the natural frequency of the electrohydraulic servo valve. The natural frequency of electro-hydraulic servo valves is generally above 100HZ, so the frequency response of the actuator of the hydraulic system is fast, and it is easy to start, brake and change quickly. The natural frequency is generally higher compared to the actuator of the electromechanical system.

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